Title:
【発明の名称】ガス放電ランプ負荷を駆動する回路
Document Type and Number:
Japanese Patent JPH05508965
Kind Code:
A
Abstract:
A circuit (100) for driving a gas discharge lamp load (102, 104, 106) and including: an inverter (112) receiving a unidirectional voltage output and producing an alternating voltage, and having a control input (156, 166); a series-resonant oscillator (126) coupled to the inverter output (116) and having an inductance (128) and a capacitance (130) in series for producing an alternating current; an output transformer (134) coupling the lamp load to the oscillator in series with the inductance and in parallel with the capacitance; and a feedback transformer (146) having a primary winding (148) coupled in parallel with the output transformer and coupled in series with the capacitance and a secondary winding (150, 152) coupled to the control input of the inverter. Since the feedback transformer primary winding carries only capacitive current (IC), the frequency of the circuit is substantially independent of the load. This allows the feedback transformer to be of the non-saturating-core type while retaining control of the oscillator frequency. Also, the circuit automatically shuts down in the event of load short-circuit.
Inventors:
Moisin, Mikhail S
Cruz, Kent Yee
Cruz, Kent Yee
Application Number:
JP50046792A
Publication Date:
December 09, 1993
Filing Date:
May 21, 1992
Export Citation:
Assignee:
Motorola Lighting Incorporated
International Classes:
H05B41/282; H05B41/24; (IPC1-7): H05B41/24; H05B41/24
Attorney, Agent or Firm:
Shinsuke Onuki (1 person outside)